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【单选题】
某化合物 (a) 溶于水呈碱性,加入盐酸产生气体,若加入 Pb (NO 3 ) 2 溶液产生黑色沉淀;另一种化合物 (b) 的水溶液呈中性,加入盐酸无变化;若加入 Pb(NO 3 ) 2 溶液产生黄色沉淀。这两种化合物是 ................... ........................ ........................ ( ) (A) Na 2 S 和 NaHCO 3 ; (B) Na 2 SO 4 和 KI ; (C) Na 2 SO 4 和 KNO3 ; (D) Na 2 S 和 KI 。
A.
Na2S 和 NaHCO3；
B.
Na2SO4 和 KI；
C.
Na2SO4 和 KNO3
D.
Na2S 和 KI。
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